Photo sensor



FIG. 1 is a rear perspective view of a photo sensor showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a right side elevational view thereof, the left side elevational view being a mirror image thereof. 

The ornamental design for a photo sensor, as shown and described. 